Winding barrier

Don Bartletti / Los Angeles Times

Border Patrol spokesman Jerome C. Conlin gazes across the base of Otay Mountain at a recently completed stretch of the U.S.-Mexico border fence. The 3.6-mile barrier through rugged terrain east of San Ysidro cost about $57 million to construct.

Border Patrol spokesman Jerome C. Conlin gazes across the base of Otay Mountain at a recently completed stretch of the U.S.-Mexico border fence. The 3.6-mile barrier through rugged terrain east of San Ysidro cost about $57 million to construct. (Don Bartletti / Los Angeles Times)

Border Patrol spokesman Jerome C. Conlin gazes across the base of Otay Mountain at a recently completed stretch of the U.S.-Mexico border fence. The 3.6-mile barrier through rugged terrain east of San Ysidro cost about $57 million to construct.